Silurian Strata near Penobscot Bay, Me. 



417 



with a decidedly strong Niagara facies. Therefore, the broader 

 term Niagara will more correctly express the chronological 

 relations of these strata. 



The Clinton species are mostly confined to the lower half of 

 the series. This is of considerable significance, but, at the 

 same time, nearly all the typical Niagara forms are associated 

 with them in abundance. Another fact to be noted is the con- 

 spicuous absence of some species from the entire series ; as, 

 Caryocrinus omatus, Spirifer niagarensis, Rhynchotreta 

 cuneata, and Pentamerus oblongus. Similar discrepancies 

 occur in the Niagara fauna at Waldron, Indiana, and elsewhere, 

 and merely serve to give distinctive features to such faunas. 



List of fossils toith their location in the section and on the map. 



Mcnograptus clintonensis Hall, L 12. 



Ccenostroma sp., L 19. 



Streptelasma calycalum Hall, L 12. J 



18, L 19. 

 Chonopbyllurn niagarense Hall, 18. 

 Favosites venustus Hall, L 19. 

 Favosites niagarensis Hall, L 19. 

 Favosites favosus Hall, J 18. 

 Oladopora sp., 18. 

 Ccenites ramulosus Hall, 1 8. 

 Monticulipora sp., J 5. 

 Halysites catenulatus Linne, L 19. 

 Heliolites spinoporus Hall, L 19. 

 Crinoid fragments, Jl,Ll,Nl,L12. 

 Cornulites sp., N 2. 

 Tentaculites sp., N 2. 

 Encrinurus punctatus WaJil., L9. L 12, 



18. 

 Calyniene niagarensis Hall, K 1 . 

 Dalmanites liniulurus Green, K 1, J 6, 



L 9. L 12. 

 Ceraurus niagarensis Hall, K 1. 

 Illsenus ioxus Hall, L 9, L 12. 

 Proetus Stokesi Hall, K 2. 

 Beyrichia, 2 species, L 4, J 6. 

 Leperditia sp., K 2, L 4. 

 Fenestella sp., K 7. (In limestone nod- 

 ule.) 

 Stictopora sp , K 2. 

 Lingula lamellosa Hall, L 12. 

 Schizocrania sp., L 4. 

 Orthis elegantula Dal, K 1, N 1, K 2, 



N 2?, J 2, N 3, N 5, L 5, J 6, L 12. 

 Orthis hybrida Sow., L 2. 

 Orthis, 2 species, L 12, 18. 

 Leptasna transversalis WahL, L 12, 



18. 

 Leptasna (cf.) sericea Sow., K 1, K 2, 



N 2, J 2, J 6. 

 Strophomena rhomboidalis Wile, L12. 

 Stropheodonta profunda Hall, N 5. 



Streptorbynchus subplanum Con., K 1. 

 Chonetes coruutus Hall, L 4. 

 Pentamerus occidentalis Hall, L 19. 

 Meristina nitida Hali,.~K. 2 ?, J 5, L 9 ? 

 Meristina sp., J 5. 

 Nucleospira pisum Hall, 18. 

 Ccelospira disparilis Hall, L 9. 

 Spirifer crispus His., K 1, N 1, J 2, K 2, 



N 2, L 5, N 5, J 6, 18. 

 Spirifer sulcatus His., J 5. 

 Spirifer radiatus Soio , L 12. 

 Cyrtina pyramidalis Hall, J 6. 

 Atrypa reticularis Linne, K 2, N 5, J 5, 



L 5, L 9. L 12. 

 Atrypa nodostriata Hall, 1 8. 

 Rhynchonella neglecta Hall, K 1, Si, 



J 2, N 2, N 5. 

 Rhynebonella obtusiplicata Hall, K 1. 

 Rhynchonella sp., K 2, J 2. 

 Rbynchonella (Wilsonia) sp., K 1, N 2. 

 Nucula sp., K 1. 

 . Tellmomya sp., N" 2. 

 Avicula demissa Con ,11. 

 ? Avicula subplana Hall, L 12. 

 Avicula sp , L 5. 

 Cypricardinia sp., 18. 

 Platyostoma niagarense Hall, L 12. 

 Loxonema sp., K 1, L 12. 

 Pleurotomaria sp., K 1, L 4, L 12. 

 Belleropbon sp., K 1, L 12. 

 Cyrtolites sp., L 12. 

 Murcbisonia sp., L 12. 

 Hyolithes sp., N 4. 

 Orthoceras annulatum Sow., K 1, L 9, L 



12. 

 Orthoceras subcancellatum Hall, L 12. 

 Ortboceras.virgulatum Hall, L 9, L 12. 

 Orthoceras (annulated), 2 species, L. 12. 

 Gomphoceras sp., L 12. 

 Cytoceras subcancellatum Hall, L 12. 



